Abstract: A method for registering a client to a server connected through a network is disclosed wherein the client being assigned with a determined network address. The method comprises sending by the client to the server, a request comprising a first network address among a sequence of at least one network address; denying by the server the request comprising the first network address among the sequence of at least one network address; sending by the client to the server, a request comprising a second network address; a granting by the server the request comprising the second network address when the second network address is derived from the determined network address and when the first network address among the sequence of at least one network address is derived from a first function using a shared secret between the client and the server and said determined network address of the client. A client device and a server device implementing the registration method are further disclosed.